The initial music, with that recognizable John Barry score and Maurice Binder titles, might lead you to believe you’re settling in for a James Bond film. What follows, though, turns out to be an elaborate spy story that feels like it could stumble at any moment. Omar Sharif is appealingly sophisticated as a man enjoying time off in Barbados when he connects with Julie Andrews. It happens that he's a high-ranking Soviet agent and she’s employed by the British Home Office. Anthony Quayle portrays a British intelligence chief who believes he’s attempting to sway her, while Oskar Homolka is cast as a Soviet general certain of something else entirely. The film requires a considerable two hours for these details to emerge. The final portion offers some unexpected developments, and the actors perform well—Sylvia Syms stands out in a less familiar part—but the narrative simply feels stretched too thin.

Source on TMDB